David, Your s seems different from mine. Can you clarify?
s=:'a';<'b';a:
s ,&< S: 0 1 {:: s
+-+-----+
|a|+-+ |
| ||0| |
| |+-+ |
+-+-----+
|b|+-+-+|
| ||1|0||
| |+-+-+|
+-+-----+
| |+-+-+|
| ||1|1||
| |+-+-+|
+-+-----+
s
+-+----+
|a|+-++|
| ||b|||
| |+-++|
+-+----+
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